Check server state (#782)

lib/api.dart

@@ -410,7 +410,7 @@ class InvenTreeAPI {
    * 5. Request information on available plugins
    */
   Future<bool> _connectToServer() async {
-    if (!await _checkServer()) {
+    if (!await checkServer()) {
       return false;
     }
 
@@ -450,8 +450,8 @@ class InvenTreeAPI {
    * Check that the remote server is available.
    * Ping the api/ endpoint, which does not require user authentication
    */
-  Future<bool> _checkServer() async {
-    String address = profile?.server ?? "";
+  Future<bool> checkServer({String? server}) async {
+    String address = server ?? profile?.server ?? "";
 
     if (address.isEmpty) {
       showSnackIcon(
@@ -462,8 +462,10 @@ class InvenTreeAPI {
       return false;
     }
 
-    if (!address.endsWith("/")) {
-      address = address + "/";
+    String url = _makeUrl("/api/", base: address);
+
+    if (!url.endsWith("/")) {
+      url = url + "/";
     }
 
     // Cache the "strictHttps" setting, so we can use it later without async requirement
@@ -473,7 +475,7 @@ class InvenTreeAPI {
 
     debug("Connecting to ${apiUrl}");
 
-    APIResponse response = await get("", expectedStatusCode: 200);
+    APIResponse response = await get(url, expectedStatusCode: 200);
 
     if (!response.successful()) {
       debug("Server returned invalid response: ${response.statusCode}");

lib/l10n/app_en.arb

@@ -294,6 +294,9 @@
   "confirmScanDetail": "Confirm stock transfer details when scanning barcodes",
   "@confirmScanDetail": {},
 
+  "connectionCheck": "Check Connection",
+  "@connectionCheck": {},
+
   "connectionRefused": "Connection Refused",
   "@connectionRefused": {},
 

lib/settings/select_server.dart

@@ -298,6 +298,9 @@ class _ProfileEditState extends State<ProfileEditWidget> {
   String name = "";
   String server = "";
 
+  bool? serverStatus;
+  bool serverChecking = false;
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -411,6 +414,49 @@ class _ProfileEditState extends State<ProfileEditWidget> {
                   return null;
                 },
               ),
+              Divider(),
+              SizedBox(
+                width: double.infinity,
+                child: ElevatedButton.icon(
+                  label: Text(L10().connectionCheck),
+                  icon: serverStatus == true
+                      ? Icon(TablerIcons.circle_check, color: COLOR_SUCCESS)
+                      : serverStatus == false
+                      ? Icon(TablerIcons.circle_x, color: COLOR_DANGER)
+                      : Icon(TablerIcons.question_mark, color: COLOR_WARNING),
+                  onPressed: serverChecking
+                      ? null
+                      : () async {
+                          if (serverChecking) {
+                            return;
+                          }
+
+                          if (!formKey.currentState!.validate()) {
+                            return;
+                          }
+
+                          if (mounted) {
+                            setState(() {
+                              serverStatus = null;
+                              serverChecking = true;
+                            });
+                          }
+
+                          formKey.currentState!.save();
+
+                          InvenTreeAPI().checkServer(server: server).then((
+                            result,
+                          ) {
+                            if (mounted) {
+                              setState(() {
+                                serverStatus = result;
+                                serverChecking = false;
+                              });
+                            }
+                          });
+                        },
+                ),
+              ),
             ],
           ),
           padding: EdgeInsets.all(16),